Choose a mode
Use the denominator −/+ buttons to set how many equal parts to slice the pizza into, and the numerator −/+ buttons (or drag up/down) to shade that many parts, then press Check
Use the denominator −/+ buttons to set how many equal parts to slice the pizza into, and the numerator −/+ buttons (or drag up/down) to shade that many parts, then press Check
3D math game · Best for grades 3-4
Fraction Slicer gives students full control: they choose how many equal slices to cut the pizza into, then decide how many to shade. The fraction is not handed to them — it is assembled from scratch, denominator first.
Separating the cutting step (denominator) from the shading step (numerator) reinforces the logical order: first divide the whole into equal parts, then decide how many parts to take. This order is essential before students can work with equivalent fractions or compare unlike denominators.
For 3/5 you cut into 5 slices first, then shade 3. Changing the denominator to 4 resizes every slice and requires reshading — showing hands-on why the numerator and denominator are linked.
Students tend to shade by visual size rather than by counting. Forcing them to set the denominator before touching the numerator breaks that habit and builds the discipline of working part-by-part.
Use it for individual practice, paired work, or a short class demonstration before worksheets.
Start with the game above, then continue with written practice to reinforce the skill.